In his decision, a judge agreed that the alleged white nationalists were being selectively prosecuted instead of 'far-left extremist groups, such as Antifa.'
It's unequal in that they're already more likely to prosecute minorities. Somehow I doubt prosecution of more white people would have changed this judge's mind.
If an individual commits one crime, prosecute them. If a different individual commits seven crimes, prosecute them seven times. That is equal treatment. Scale up to any political or racial group and that is the model that is to be followed.
In this case, certain political groups get prosecuted at lower rates due to their politics. That is a problem that will continue, and people will continue to go free, unless prosecutors treat groups equally regardless of their politics, race, sex, etc.